Engine



Nov. 11, 1941. c. F. BRAKMEIER ENGINE 2 Sheets-Sheet l Filed Oct.

Inventor 6/09?) 2'0- 5 rd%ma2 Nov. 11, 1941. c. F. BRAKMEIER 2,262,089

.ENGINE Filed Oct. 7, 1940 2 Sheets-Sheet 2 VA cuuM PUMP Inventor A iiorney 67/7757? Bra fme lr Patented Nov. 11, 1941 UNITED STATES PATENT OFFICE ENGINE Clifford F. Brakmeier, Princeton, Ind.

ApplicationOctober 7, 1940, SerialNo. 360,189

'5 Claims.

This invention relates to an engine of the internal combustion type, the object of the invention'being to provide means to so control the compression pressure in the cylinder as to prevent pre-ignition of the motor fuel in the cylinder in varying altitudes and atmospheric pressures, the accompanying drawings and description showing one manner of carrying out the invention.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is a fragmentary elevational view partly diagrammatic showing a motor constructed in accordance with this invention.

Figure 2 is a vertical sectional view through Figure 1 and showing the valve closed.

Figure 3 is a view of the vacuum controlling valve.

Figure 4 is a section on the line 4-4 of Figure 2.

In these views, the numeral I indicates the cylinder block having a plurality of cylinders therein one of which is shown at 2 and the numeral 3 indicates the piston in said cylinder, these parts being of any suitable construction. The exhaust valve is shown at 4 and the inlet valve at 5, and the. exhaust port or passage is shown at 6 and the inlet passage at l. The exhaust valve 4 is normally held closed by a spring 8 and is open by a rocker arm 9 on a shaft l0 driven from any suitable part of the engine and this arrangement can also be of any suitable construction and forms no part of my invention.

In carrying out my invention I provide a small housing I 1 into which the upper end of the shank of the inlet valve 5 extends and a piston I2 is connected to the upper end of the shank and has sliding movement in the housing I I. A spring I 3 tends to hold the piston and the valve in raised position with the head of the valve engaging the seat as shown in Figure 2. A vent I4 is formed in the lower part of the housing so that the piston [2 can move downwardly without being interfered with by air trapped in the housing. A vacuum pump P is driven in any suitable manner and a pipe l5 connects the inlet of the pump with a valve casing [6 while a pipe I! connects the casing it with the upper end of the housing H.

The casing l6 hasa partition l8 therein having anopening l9 and a ball valve 20 is pressed upwardly to close the opening H! by a spring 2! the tension of which is regulated by a screw 22 passing through a threaded hole in the lower part of the casing l6.

Thus it will be seen that normally the vacuum created by the pump will unseat the valve 20 and cause a vacuum in the upper end of the housing H and thus the piston I2 is drawn upwardly to'hold the valve upon the seat. However, upon downward movement of the piston 3 a vacuum will be created in the combustion chamber atvthe upper end of the cylinder and when this suction becomes stronger than the vacuum or suction in the top of the housing II and the spring I3, the valve 5 will open and thus an explosive mixture will be drawn into the combustion chamber. When the pressure of the mixture flowing into the combustion chamber reaches a certain degree the spring l 3 and the vacuum acting on the piston l2 will close the inlet valve. As will be seen the piston I2 is of the same diameter as the inlet valve 5.

This attachment causes the piston to start its compression stroke under vacuum, which is great enough to keep the remainder of the stroke, after no vacuum exists, from bringing the pressure too high. The charge is then ignited and the full piston stroke is utilized before the exhaust valve is open. This causes a condition comparable to a short intake stroke and a long power stroke. The control valve 20 holds the vacuum at a certain amount from absolute so that the vacuum in chamber or casing [6 decreases as pressure decreases so that the motor will not be affected until the pressure drops below the decrease in valve casing Hi. This invention eliminates the use of push rods and rocker arms and other parts for operating the intake valve and the connecting rod for the piston 3 can be lengthened over those now in use to produce a compression ratio of 16 to 1 or even higher.

As Will be seen the time of closing of the inlet valve will be automatically controlled by the varying atmospheric pressures at varying altitudes as the atmospheric pressure entering the combustion chamber with the explosive mixture will control the time of closing of the inlet valve by the suction at the top of the housing II and thus the invention will prevent pre-ignition of the fuel in all altitudes.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction and in the combination and arrangement of the several parts provided that such changes fall within the scope of the appended claims.

Having described the claimed as new is:

1. In an engine of the class described including a cylinder, a piston and an inlet valve, a housing into which the stem of the inlet valve extends, a piston connected with the stem and sliding in the housing, spring means normally holding the piston in the housing in raised position with the valve closed, and.means for pro ducing a suction in the upper end of the housing for helping the spring hold the valve raised;

2. In an engine of the class described including invention, what is a cylinder, a piston and an inlet valve, a housing into which the stem of the inlet valve extends, a piston connected with the stem and sliding in the housing, spring means normally holding the piston in the housing in raised position with the valve closed, and means for producing asuction in the upper end of the housing for helping the spring hold the valve raised, and a spring closed valve for controlling the vacuum.

3. In an engine including a cylinder, a piston and an inlet valve, a housing into which the stem of the valve extends, a piston in the housing connected with the stem, a vacuum producing device, a conduit leading therefrom to the housing for creating a suction on the piston for holding the valve closed, a valve casing located in the conduit and having a seat therein, an upwardly closing valve for the seat, a spring for holding the valve closed, means for adjusting the tension of the spring, said valve tending to be opened by the vacuum created by the vacuum producing device.

4. In an engine including a cylinder, a piston and an inlet valve, a housing into which the stem of the valve extends, a piston in the housing connected with the stem, a vacuum producing device, a conduit leading therefrom to the housing for creating a suction'on the piston for holding the valve closed, a valve casing located in the conduit and having a seat therein, an upwardly 5 closing valve for the seat, a spring for holding the valve closed, means for adjusting the tension of the spring, said valve tending to be opened by the vacuum created by the vacuum producing device, and a spring in the housing and engaging the piston and tending to hold the inlet valve in closed position.

5. In an engine including a cylinder, a piston and inlet means including an inlet valve, means for subjecting a part of the valve to suction for normally holding the valve closed but permitting the valve to open when the suction created in the cylinder by, the suction stroke of the piston overcomes the closing action of the suction means, the valve remaining open until the flow of mixture into the cylinder reduces the suction therein to a point less than the closing suction action for holding the valve closed.

CLIFFORD RBRAKMEIER, 

